Yes Ragyo is definitely on the short list of worst mothers, but I have to give my vote to a tie between Youko Nanase from Magical Warfare and Saika Gasai from Mirai Nikki. They are both the direct cause of the mess that their respective children have to go through, one through lies and the other through her own slide into insanity. Best mother is easily Yasuko Takasu from Toradora. She is in no way a perfect mother, but when her son needs her, she grows the backbone necessary to shut her parents up about Ryuuji and Taiga's relationship.

Also the best Grandma, I might add. The way she manipulates Tomoya into becoming a good father again is just awesome--and it's done in a consistently understanding and loving way. We could all use someone like that in our lives.

Worst: I'm going to have to second whoever suggested Hitagi Senjohara's mom from Bakemonogatari.

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Seriously, inviting a cult leader over to rape your daughter is just... wow...